Using the data furnished in Problem 4-9, draw the histogram frequency distribution and cumulative percentage distribution for each set of data and determine (a) average speed, (b) 85th-percentile speed, (c) 15th-percentile speed, (d) mode, (e) median, and (f) pace.

What will be an ideal response?


(a) average speed = ?ui / ?fi

“before” average = 1053/30 = 35.1 mi/h

“after” average = 824/30 = 27.5 mi/h

(b) 85%-ile speeds from cumulative distribution plots

before = 38.4 mi/h

after = 33.3 mi/h

(c) 15%-ile speeds from cumulative distribution plots

before = 30.8 mi/h

after = 20.5 mi/h

(d) mode from histograms

before = 35 mi/h

after = 21 mi/h

(e) median from cumulative distribution plots

before = 34.5 mi/h

after = 27 mi/h

(f) pace from histograms

before = 30 – 40 mi/h

after = 21 – 31 mi/h

Before data set:



After data set:

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